You may be right. It may not be that difficult once one gets used to it. After thinking about what you said, it could conceivably be practical if color is assigned in terms of rank.
In any case, I'm thankful that I have the technical competence to be able to do what I do. Many deaf people are stuck with what they are given. I know quite a few people who are deaf that have difficultly reading the subtitles on blu-rays.